US PATENT SUBCLASS 184 / 32
.~.~.~ Oscillating piston


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184 /   HD   LUBRICATION

14  DF  LUBRICATORS {18}
*  DD  .~ Force feed {5}
26  DF  .~.~ Pumps {10}
32.~.~.~ Oscillating piston


DEFINITION

Classification: 184/32

The piston is so arranged that by its own oscillation it covers and uncovers ports, so that during its forcing stroke a lubricant is forced through an outlet-passage and upon its suction-stroke the lubricant is admitted to the pump-cylinder.